JPS61227265A - Method for lowering power consumption of floppy disk drive - Google Patents

Abstract

PURPOSE:To lower a power consumption by providing an AND circuit of a motor signal and a drive select signal and turning on a rotating drive device of a floppy disk only when a logical of both the signals is '1'. CONSTITUTION:In an FDD 2, an on-off means 3 on-off controls a rotating drive device. An AND circuit 5 receives a motor 'on' signal MON from an FDDC 1 and a drive select signal DS and supplies and AND signal of both of signals to the on-off means. When both the motor 'on' signal MON and the drive select signal DS is logical '1', the AND circuit 5 outputs logical '1', and the on-off means 3 turns on a rotating drive device 4 of an FD. When at least one of the motor 'on' signal MON and the drive select signal DS is logical '0', the AND circuit 5 outputs logical '0', and the on-off means 3 turns off the rotating drive device 4 of the FD namely brings to a stand by condition. Thereby, a complete low power consumption can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for reducing power consumption of a floppy disk drive (hereinafter abbreviated as FDD), particularly for an FDD controlled by an FDD controller (hereinafter abbreviated as FDDC).
This invention relates to a method for reducing power consumption.

[Conventional technology]

A floppy disk (hereinafter referred to as FD) with a magnetic recording medium coated on the surface of a flexible plastic thin film is driven to rotate, and an IJ-dry head is moved in the radial direction of the FD to record information at a desired track position. A 5FDD is well known and is widely used as an external storage device for computers.

Due to the recent demand for miniaturization, these types of FDs and FDDs have become smaller and portable. For this reason, there is a strong desire for FDDs to have lower power consumption in order to suppress the heat generation of the device itself and to accommodate the adoption of small capacity batteries in portable FDDs.

The most widely used method for reducing the power consumption of a well-known FDD will be explained with reference to FIG.

The FDD 22 has an FD rotation drive device 24 and an on/off means 23 for controlling the rotation drive device on and off.
The rotary drive device 24 is controlled into a rotating state and a non-rotating state (hereinafter referred to as a standby state) by a motor on signal MON supplied from 1 to the on/off means 23.

It is also well known to use a drive select signal DS in place of the motor-on signal MON shown in FIG.

In addition, the motor on signal MON and drive select signal DS
A method has also been proposed in which the OR signal of the borrowed symbols within 5 is substituted, so that it can support FDDC using either of the following.

[Problem that the invention seeks to solve]

However, with such conventional technology, a standby state as a low power consumption state cannot be sufficiently obtained, resulting in insufficient reduction in power consumption.

That is, in the control using the motor-on signal MON shown in FIG. 2, even when the drive select signal DS is logic 0, that is, no drive is selected, if the motor-on signal MON is logic 1, the standby state will not occur. Further, in the control using the drive select signal DS, even when the motor-on signal MON is a logic 0, that is, there is no need to turn on the FD rotation drive device, if the drive select signal DS is a logic 1, the standby state will not occur. Furthermore, in the control based on the logical sum of the drive select signal DS and the motor-on signal MON, even if one of the two signals is at logic 0, the standby state will not occur if the other is at logic 1.

The present invention aims to improve the above-mentioned conventional method for reducing power consumption, and to provide a method that can easily achieve a sufficiently low power consumption of an FDD.

[Means for solving problems]

In order to achieve the above object, the present invention provides a motor-on signal M
The present invention is characterized by the fact that the maximum power consumption is reduced when ON and the drive select signal DS are set to a borrowed-by state, and an AND circuit is provided to take an AND of these two signals.

[Effect]

According to the present invention, the AND circuit is added to the conventional FDD in a low power consumption state, the AND circuit is supplied with the motor-on signal MON and the drive select signal DS from the FDDC, and the AND circuit of the two signals is Power consumption is reduced by placing the FDD in a standby state using the inverted signal.

〔Example〕

The present invention will be explained in detail below with reference to FIG.

FIG. 1 shows the main parts of the FDD 2 according to the present invention and the FDDCl that controls it.

In the FDD 2, 4 is a rotary drive device for the FD, 6 is an on-off means for controlling the rotary drive device on and off, and 5 is supplied with a motor-on signal MON and a drive select signal DS from the FDDCi, and a logical product signal of both signals is used to control the on-off operation. It is an AND circuit that supplies the means.

Here, when both the motor on signal MON and the drive select signal DS are logic 1, the AND circuit 5 outputs logic 1, and the on/off means 6 turns on the FD rotation drive device 4. The on/off means 6 outputs the lesser of the motor on signal MON and the drive select signal 1)S, and the on/off means 6 turns off the FD rotational drive device 4, that is, puts it into a standby state.

Therefore, according to the present invention, sufficient power consumption can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, an AND circuit is provided for the motor signal and the drive select signal, and the floppy disk rotation drive device is turned on only when both signals are logical 1. It is possible to achieve significantly lower power consumption compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram to which the method for reducing power consumption of a floppy disk drive according to the present invention is applied, and FIG. 2 is a circuit block diagram of a conventional example. 1... Floppy disk drive controller, 2... Floppy disk drive, 3...
. . . ON/OFF means, 4 . . . Floppy disk rotation drive device, 5
・・・・・・Logic circuit.

Claims (1)

[Claims] In a floppy disk drive including a floppy disk rotational drive device and an on/off means for turning on and off the rotational drive device, the on/off means is controlled by an AND signal of a motor on signal and a drive select signal from a floppy disk drive controller. A method for reducing power consumption of a floppy disk drive, characterized by providing an AND circuit.